package day07_collections_map.com.itheima.d4_map;

import java.util.HashMap;

public class MapDemo1 {
    public static void main(String[] args) {
        HashMap<String, Integer> map = new HashMap<>();
        map.put("张三", 100);
        map.put("张三1", 99);
        map.put("张三2", 98);
        map.put("张三3", 97);
        map.put("张三4", 96);
        System.out.println(map);

        map.put(null, null);
        System.out.println("map = " + map);
    }
}
